Glossaries
| Term | Definition |
|---|---|
| Public Switched Telephone Network | Public Switched Telephone Network (PSTN) is the standard telephone service provided over basic analogue phone lines. |
| PSTN | The public switched telephone network is the name given to the wider telephone network used to make calls locally and globally that is independent from the internet. If you have a home telephone then it is likely that you make and receive calls via the PSTN that your phone connects to via a port in the wall. Some businesses still use old fashioned PSTN lines where each phone has a set phone number and line, though this is considered redundant technology and will be phased out by 2025. |
| Private Cloud | Private cloud is a term used to describe the common cloud computing model whereby a service provider makes resources like software or data storage available over the Internet. |
| Point of Presence | A Point of Presence (PoP) is the point at which a telecoms carrier establishes a physical presence in a geographic area, and at which the local exchange carriers (LECs) terminate access services. The PoP can consist of high-speed telecommunications equipment and technologies that enable users to connect to the Internet via their ISP. The PoP can include call aggregators, modem banks, routers, and high-speed Asynchronous Transfer Mode (ATM) switches. |
| PBX | A Private Branch Exchange is a physical device, normally located within the client’s premise. A PBX manages the internal call switching within an office and allows users, whose VOIP phones are connected to it, to share a limited number of public telephone lines. |
| Packet Switching | |
| PaaS | PaaS (Platform-as-as-Service) is a category of Cloud Computing services that provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure. |
© 2026 Exponential-e Ltd. Reg. No. 04499567, Reg. Address:100 Leman Street, London E1 8EU